There is no custom rom for this and there won't be. It uses a MediaTek SOC. The bootloaders cannot be unlocked.
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Have you checked with Lineage? That's the most likely source.
Samsung phones are complex - if it can be unlocked depends on the exact model number (not just A15, there are often separate versions of each model).
Generally, US versions aren't unlockable or flashable. Generally.
I gave up on Samsung several years ago because I got tired of fighting to do anything. Even the unlock and flash procedures were a pain.
And what phone you suggest?
- Apple: No thanks. I want to sideload all my apps!
- Pixel: Fuck google but W graphene
- Chinese phone: No thanks
Chinese phones that let you unlock the bootloader are actually a great deal
I can bite the bullet and get a Pixel phone. In that case I would say I am supporting the phone, not the other services.
Not the best solution but either that or some refurbished phones from ebay/Amazon and considering I've had bad experience with both, I think the source is the best option
I'll see what I can do.